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Thursday, July 30, 2020 | History

2 edition of **Two-dimensional calculation of finite-Beta modifications of drift and trapped-electron modes** found in the catalog.

Two-dimensional calculation of finite-Beta modifications of drift and trapped-electron modes

G. Rewoldt

- 298 Want to read
- 34 Currently reading

Published
**1980**
by Dept. of Energy, Plasma Physics Laboratory, for sale by the National Technical Information Service] in Princeton, N.J, [Springfield, Va
.

Written in English

- Beta rays.,
- Electrons.

**Edition Notes**

Statement | G. Rewoldt, W. M. Tang, and E. A. Frieman, Plasma Physics Laboratory, Princeton University. |

Series | PPPL ; 1656, PPPL (Series) -- 1656. |

Contributions | Tang, W. M., Frieman, E. A., United States. Dept. of Energy., Princeton University. Plasma Physics Laboratory. |

The Physical Object | |
---|---|

Pagination | 17 p. : |

Number of Pages | 17 |

ID Numbers | |

Open Library | OL15243606M |

Turbulence is considered to cause anomalous transport in magnetically confined plasmas [1–3], and is mainly driven by drift-wave instabilities such as ion-temperature-gradient (ITG) mode and trapped electron mode (TEM).The drift-wave turbulence produces zonal flows through nonlinearity, then the turbulence is regulated by the zonal flows at low β [].Cited by: 4. Experimental drift turbulence and zonal flow studies in magnetically confined plasma experiments are reviewed. The origins of drift waves, transition to drift turbulence and drift turbulence–zonal flow interactions in open field line and toroidal closed flux surface experiments are discussed and the free energy sources, dissipation mechanisms and nonlinear dynamics of drift Cited by:

Part of theElectromagnetics and Photonics Commons, and theOptics Commons. This Doctoral Dissertation (Open Access) is brought to you for free and open access by STARS. It has been accepted for inclusion in Electronic Theses. and Dissertations by an authorized administrator of by: 2. About this book Introduction To be perfect does not mean that there is nothing to add, but rather there is nothing to take away Antoine de Saint-Exupery The drift-diffusion approximation has served for more than two decades as the cornerstone for the numerical simulation of semiconductor devices.

deduce ohms law by the concept of drift velocity. Share with your friends. Share 8. Consider a current of length l and cross sectional area A. When a potential difference V is applied across its ends, the current produced is I. If n is the number of 4/5(62). Book Search tips Selecting this option will search all publications across the Scitation The physics mechanisms of the weakly coherent mode in the Alcator C-Mod Tokamak. Z. X. Liu Parameter dependence of two-fluid and finite Larmor radius effects on the Rayleigh-Taylor instability in finite beta plasmas. Atsushi Ito and Hideaki Miura.

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A previous two‐dimensional electrostatic calculation for the spatial structure of drift and trapped‐electron modes is extended to include finite‐β effects. Specifically, the parallel perturbed vector potential, and the parallel Ampere’s law are added to the by: 4. Get this from a library.

Two-dimensional calculation of finite-Beta modifications of drift and trapped-electron modes. [G Rewoldt; W M Tang; E A Frieman; United States.

Department of Energy.; Princeton University. Plasma Physics Laboratory.]. A previous two-dimensional electrostatic calculation for the spatial structure of drift and trapped-electron modes is extended to include finite-β effects.

Specifically, the parallel perturbed vector potential, and the parallel Ampere's law are added to the calculation. A previous two-dimensional electrostatic calculation for the spatial structure of drift and trapped-electron modes is extended to include finitebeta. effects. trapped electron mode (TEM) [6–11], and universal drift instabilities [12–14], are some of the examples of such unstable modes at the ion scale while the electron temperature gradient.

Numerical modeling results of the linear drift tearing modes are presented. The present model is based on the two-fluids equations, and the perturbed bootstrap current is also included. The electron temperature and the density perturbations are self-consistently calculated by solving the two-dimensional transport equations.

It is found that, with the inclusion of the electron perpendicular Cited by: In the mathematical modeling and numerical simulation of semiconductor devices, the drift-diﬀusion system is widely used [19]. This system consists of the continuity equations for particle densities and a Poissonequation for electrostatic potential.

It can be derived from the Euler–Poisson equations when the relaxation time goes to Size: KB. Turbulence and transport due to fully toroidal ion temperature gradient driven drift waves and a collisionless trapped electron mode have been studied by mode coupling simulations and with the.

drift in the direction of, the sign of which depends upon the sign of and. qB qB B 9 A Quantitative Analysis: Grad-B Drift (continued) In a non-uniform -field, the particle only "sees" the variation of the field over a distance of the particle's Larmor radius, which is usually much smaller than th B e scale length of the field.

Thus we may. Finite Volume Discretization of the Heat Equation We consider ﬁnite volume discretizations of the one-dimensional variable coeﬃcient heat equation,withNeumannboundaryconditionsFile Size: KB. 1D Numerical Methods With Finite Volumes Guillaume Ri et MARETEC IST 1 The advection-diﬀusion equation The original concept, applied to a property within a control volume V, from which is derived the integral advection-diﬀusion equation, states asFile Size: KB.

The linear instabilities and nonlinear transport driven by collisionless trapped electron modes (CTEM) are systematically investigated using three-dimensional gyrokinetic δf particle-in-cell. Special attention is focused on low-frequency electrostatic drift-type modes, which are generally believed to be the dominant tokamak microinstabilities under normal operating conditions.

The basic linear formalism including electromagnetic (finite-beta) modifications is. Abstract. We discuss the existence of a blow-up solution for a multi-component parabolic–elliptic drift–diffusion model in higher space dimensions.

We show that the local existence, uniqueness and well-posedness of a solution in the weighted spaces. Moreover we prove that if the initial data satisfies certain conditions, Cited by: 3. FD2D_HEAT_STEADY is available in a C version and a C++ version and a FORTRAN90 version and a MATLAB version and a Python version.

Related Data and Programs: FD1D_HEAT_STEADY, a MATLAB program which uses the finite difference method to solve the 1D Time Independent Heat Equations. Coupling of ion temperature gradient and trapped electron modes in the presence of impurities in tokamak plasmas.

Benchmarking kinetic calculations of resistive wall mode stability. Berkery, Y. Liu, Z. Wang, Two-dimensional single-stream electron motion in. Finite time blow up for a solution to system of the drift–diffusion equations in higher dimensions.

Global Existence of Solutions to a Parabolic-Elliptic System of Drift-Diffusion Type in R2 Recommended Recommended Biological transportation networks: Modeling and by: 7. Rotation and gyration of ﬁnite two-dimensional modes Kurt Bernardo Wolf1,* and Tatiana Alieva2 1Instituto de Ciencias Físicas, Universidad Nacional Autónoma de México, Av.

Universidad s/n, Cuernavaca, MorelosMexico 2Universidad Complutense de Madrid, Facultad de Ciencias Físicas, Ciudad Universitaria s/n, MadridSpain *Corresponding author: [email protected] Trapped electron effects.

Gyro-fluid turbulence codes involving the dynamics of bounce-averaged trapped electrons were developed in the mid's. Here, passing electrons and finiteβ effects were neglected. Trapped electrons can contribute to the drive of ITG modes, but they may also be the source of trapped electron modes (TEMs).Cited by: The Drift Diffusion Equation and Its Applications in MOSFET Modeling (Computational Microelectronics) [Hänsch, Wilfried] on *FREE* shipping on qualifying offers.

The Drift Diffusion Equation and Its Applications in MOSFET Modeling (Computational Microelectronics)Format: Paperback. This paper analyzes several important features of trapped-particle instabilities.

For trapped-electron modes, the complete two-dimensional (2D) spatial structure, including the effects of magnetic shear, is numerically calculated within the framework of a differential formulation for long radial wavelength modes.• Instances when Drift-Diffusion Equation can represent the trend (or predict the mean behavior of the transport properties) – Feature length of the semiconductors smaller than the mean free path of the carriers • Instances when Drift-Diffusion equations are accurate – Quasi-steady state assumption holds (no transient effects)File Size: KB.CHAPTER 3 Magnetic Circuit Design and Analysis using Finite Element Method Introduction In general, the Finite Element Method (FEM) models a structure as an assemblage of small parts (elements).

Each element is of simple geometry and therefore is File Size: 5MB.